Stadium: Court 8 Round: 25 Ground: Clay
| Challenger Marburg Qual | 2018/06/30 12:40 | Johannes Haerteis v Daniel Masur | 4-6,4-6 |
| Challenger L'Aquila | 2018/06/19 10:00 | Johannes Haerteis v Riccardo Balzerani | 6-4,2-6,4-6 |
| Challenger L'Aquila Qual | 2018/06/18 09:55 | Zhizhen Zhang v Johannes Haerteis | 5-7,6-7 |
| Challenger L'Aquila Qual | 2018/06/17 13:30 | Johannes Haerteis v Liam Caruana | 7-6,6-0 |
| Challenger L'Aquila Qual | 2018/06/16 14:25 | Johannes Haerteis v Jordan Correia | 1-6,7-6,7-6 |
| ITF Italy F14 | 2018/06/13 14:20 | Riccardo Bellotti v Johannes Haerteis | 6-3,6-2 |
| ITF Italy F14 | 2018/06/12 18:25 | Lorenzo Frigerio v Johannes Haerteis | 7-5,2-6,4-6 |
| ITF Italy F14 Qual | 2018/06/10 08:30 | Johannes Haerteis v Alessandro Ceppellini | 6-2,6-0 |
| ITF Austria F2 | 2018/07/08 08:00 | Jonathan Stenberg v Jonathan Morr | 5-7,4-6 |
| ITF Austria F2 | 2018/07/07 08:00 | Jonathan Stenberg v Christian Fellin | 6-1,6-0 |
| ITF Austria F1 | 2018/06/30 11:00 | Jonathan Stenberg v Laurin Aerne | 0-6,6-7 |
| ITF Sweden F3 | 2018/05/23 09:15 | Manuel Guinard v Jonathan Stenberg | 6-0,6-0 |
| ITF Sweden F3 | 2018/05/22 11:35 | Milos Sekulic v Jonathan Stenberg | 6-7,6-7 |
| ITF Sweden F3 Qual | 2018/05/20 09:00 | Robin Thour v Jonathan Stenberg | 6-4,5-7,5-7 |
| ITF Sweden F3 Qual | 2018/05/19 10:40 | Kevin Kylar v Jonathan Stenberg | 3-6,5-7 |
| ITF Sweden F2 | 2018/05/16 11:55 | Jonathan Stenberg v George Botezan | 1-6,4-6 |